On
behalf of Managers AMG Funds (the Trust) and pursuant to Rule 497(c) under the Securities Act of 1933, as amended, accompanying this letter for filing are exhibits containing an XBRL interactive data file relating to the supplement,
filed with the Securities and Exchange Commission on January 3, 2013 under Rule 497(c) (SEC Accession No. 0001193125-13-002390), to the Prospectus for TimesSquare International Small Cap Fund dated January 2, 2013.

The purpose of this filing is to submit an XBRL interactive data file in the manner provided by Rule 405 of Regulation S-T,
General Instruction C.3.(g) of Form N-1A, and Rule 497(c).

If you have any questions concerning this filing, please call
me at (202) 508-4671.